NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Peter G. O'Brien, FNP

Family Nurse Practitioner in Murrieta, CA · enumerated 2016 · practices at A Plus Walk in Urgent Care Medical Clinic Apc.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1639533490

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)
Name Peter G. O'Brien
Credential FNP
Sex Male
Practice address 41880 Kalmia St Ste 100, Murrieta, CA, 92562
Phone (951) 397-4226
Fax (951) 461-6973
Enumeration date Apr 7, 2016
Last updated in NPPES Mar 10, 2020

Taxonomy & licenses

363LF0000X Family Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 95003926 (CA) Primary
FNP · Family Nurse Practitioner: A nurse practitioner certified in family practice across the lifespan. About the FNP credential

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

How do I verify Peter O'Brien's NPI record?
Cross-check NPI 1639533490 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Is NPI 1639533490 active?
Yes, as of the latest NPPES snapshot, NPI 1639533490 is active (record last updated 2020-03-10).

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-03-10.